慢慢消失用英语怎么说？

慢慢消失

例句

• The economic boom tapered off in the 1970s. 经济繁荣在七十年代慢慢消失了。
• Little by little she lost the taut, strained air of perpetual anxiety. 长期焦虑带来的紧张而疲惫的神色从她脸上慢慢消失了。